Modify Dependabot settings for GitHub Actions (#857)

Updated Dependabot configuration to allow only 1 open pull request for GitHub Actions and removed specific reviewers.

Author: Borda

.github/dependabot.yml

@@ -13,10 +13,12 @@ updates:
     pull-request-branch-name:
       # Separate sections of the branch name with a hyphen for example, `dependabot-npm_and_yarn-next_js-acorn-6.4.1`
       separator: "-"
-    # Allow up to 5 open pull requests for GitHub Actions
-    open-pull-requests-limit: 5
-    reviewers:
-      - "borda"
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+    # Allow up to 1 open pull requests for GitHub Actions
+    open-pull-requests-limit: 1
 
   # Enable version updates for python
   - package-ecosystem: "pip"
@@ -33,5 +35,3 @@ updates:
       separator: "-"
     # Allow up to 5 open pull requests for pip dependencies
     open-pull-requests-limit: 5
-    reviewers:
-      - "willingc"